<?php

/*
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 */

/**
 * Description of ValidateCode
 *
 * @author shybily
 */
class ValidateCode {

    private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789'; //随机因子  
    private $code; //验证码  
    private $codelen = 4; //验证码长度  
    private $width = 73; //宽度  
    private $height = 30; //高度  
    private $img; //图形资源句柄  
    private $font; //指定的字体  
    private $fontsize = 20; //指定字体大小  
    private $fontcolor; //指定字体颜色  

    //构造方法初始化  

    public function __construct() {
        $this->font = APP_PATH . '/data/font/Mono.ttf'; //注意字体路径要写对，否则显示不了图片  
        //var_dump($this->font);exit;
        $this->createCode();
    }

    //生成随机码  
    private function createCode() {
        $_len = strlen($this->charset) - 1;
        for ($i = 0; $i < $this->codelen; $i++) {
            $this->code .= $this->charset[mt_rand(0, $_len)];
        }
    }

    //生成背景  
    private function createBg() {
        $this->img = imagecreatetruecolor($this->width, $this->height);
        $color = imagecolorallocate($this->img, mt_rand(157, 255), mt_rand(157, 255), mt_rand(157, 255));
        imagefilledrectangle($this->img, 0, $this->height, $this->width, 0, $color);
    }

    //生成文字  
    private function createFont() {
        $_x = $this->width / $this->codelen;
        $this->code = empty($this->code) ? $this->createCode() : $this->code;
        for ($i = 0; $i < $this->codelen; $i++) {
            $this->fontcolor = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
            imagettftext($this->img, $this->fontsize, mt_rand(-30, 30), $_x * $i + mt_rand(1, 5), $this->height / 1.4, $this->fontcolor, $this->font, $this->code[$i]);
        }
    }

    //生成线条、雪花  
    private function createLine() {
        //线条  
        for ($i = 0; $i < 6; $i++) {
            $color = imagecolorallocate($this->img, mt_rand(0, 156), mt_rand(0, 156), mt_rand(0, 156));
            imageline($this->img, mt_rand(0, $this->width), mt_rand(0, $this->height), mt_rand(0, $this->width), mt_rand(0, $this->height), $color);
        }
        //雪花  
        for ($i = 0; $i < 100; $i++) {
            $color = imagecolorallocate($this->img, mt_rand(200, 255), mt_rand(200, 255), mt_rand(200, 255));
            imagestring($this->img, mt_rand(1, 5), mt_rand(0, $this->width), mt_rand(0, $this->height), '*', $color);
        }
    }

    //输出  
    private function outPut() {
        header('Content-type:image/png');
        imagepng($this->img);
        imagedestroy($this->img);
    }

    public function doimg() {
        $this->createBg();
//        $this->createCode();
        $this->createLine();
        $this->createFont();
        $this->outPut();
    }

    //获取验证码  
    public function getCode() {
        return strtolower($this->code);
    }

}
